// 數據庫User表
public class User 
{
    public int UserId { get; set; } // 用戶編號
    public string UserName { get; set; } // 用戶名稱
    public int Age { get; set; } // 年齡
    public DateTime? CreateAt { get; set; } // 創(chuàng)建時間
    public int CreateBy { get; set; } // 創(chuàng)建人
    public DateTime Birthday { get; set; } // 生日
}

public class UserRequestDto 
{
    public string UserName { get; set; }
    public DateTime Birthday { get; set; }
}

public async Task Create(UserRequestDto request) 
{
    // 實例化一個User實體，并且將用戶填寫內容一個一個賦值
    User user = new User();
    user.UserName = request.UserName;
    user.Birthday = request.Birthday;
    user.CreateAt = DateTime.Now;
    ....
    // 創(chuàng)建用戶
    await context.User.InsertAsync(user);
}

// 一行代碼搞定，就是這么神奇
User user =  request.Adapt<User>();

context.User.Select(x => new UserDto 
{
    UserName = x.UserName,
    Age = x.Age
    ...
    ...
})

var result = context.User.ProjectToType<UserDto>().ToList();

// 在數據映射時，將出生日期通過計算方法映射給返回的Age
TypeAdapterConfig<User, UserDto>
    .NewConfig()
    .Ignore("Id")//指定忽略某些字段
    .Map(dest => dest.Age,
         src => CalcAge(src.Birthday));

public void ConfigureServices(IServiceCollection services)
{
    var config = new TypeAdapterConfig();
    services.AddSingleton(config);//使用單例注冊
    services.AddScoped<IMapper, ServiceMapper>();//注冊服務
}
// Service進行依賴注入
private readonly IMapper _mapper;
public UserService(IMapper mapper) {
    _mapper = mapper;
}
public void Create(UserRequestDto request) {
    // 使用服務
    var user = _mapper.Map<User>(request);
}

decimal i = 123.Adapt<decimal>();// int轉換成decimal
var e = "Read, Write, Delete".Adapt<Enum>(); // 枚舉